Security readout for executives and security teams
Plain-English summary
This issue affects older UpdraftPlus WordPress Backup Plugin versions. A crafted link could cause script to run in a WordPress admin page if a user follows it. Business impact is mainly account/session misuse or unauthorized actions in the victim’s browser, not direct server takeover from the source evidence.
Executive priority
Treat as a routine but time-bound WordPress plugin update. Prioritize sites with many administrators, exposed admin portals, or high-value WordPress sessions. This is not shown as actively exploited in the provided evidence.
Technical view
UpdraftPlus before 1.16.66 failed to sanitize and escape backup_timestamp and job_id before reflecting them in admin pages, creating reflected XSS. CVSS 3.1 is 6.1: network reachable, low complexity, no attacker privileges, user interaction required, changed scope, low confidentiality and integrity impact.
Likely exposure
WordPress sites running the UpdraftPlus WordPress Backup Plugin before 1.16.66 are the known exposure. The vulnerable output is described in admin pages, so practical risk depends on exposed WordPress administration workflows and whether users can be lured to crafted links.
Exploitation context
The bundle does not cite CISA KEV or any public source proving active exploitation. Exploitation requires user interaction. The impact is reflected XSS, so risk increases for administrators or privileged WordPress users who handle backup plugin pages.
Researcher notes
The key weakness is CWE-79 reflected XSS from insufficient parameter sanitization and output escaping. The provided record names backup_timestamp and job_id. Evidence supports affected versions before 1.16.66 and a medium CVSS score; it does not establish exploit-in-the-wild status.
Mitigation direction
- Upgrade UpdraftPlus to version 1.16.66 or later.
- Prefer the current supported plugin release from WordPress.org.
- Warn administrators not to open unexpected WordPress admin links.
- Limit WordPress admin access to trusted networks where practical.
- Check vendor and WordPress plugin guidance for any additional remediation.
Validation and detection
- Inventory WordPress sites using the UpdraftPlus plugin.
- Confirm installed UpdraftPlus versions are 1.16.66 or later.
- Review scanner findings for CVE-2021-25022 on WordPress assets.
- Check logs for unusual admin requests containing backup_timestamp or job_id.
- Validate in staging that reflected parameters are escaped after update.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-25022 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://wpscan.com/vulnerability/1801c7ae-2b5c-493f-969d-4bb19a9feb15CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/changeset/2635585/updraftplusCVE reference · x_refsource_CONFIRM
- https://plugins.trac.wordpress.org/changeset/2637112/updraftplusCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.